Updates to all dependencies

- Fixes for latest version of async which introduced breaking change --> caolan/async#1641
- Removed ignore dep from .ncurc.json as all issues have been resolved
- Following dependencies were updated:
 async          2.6.2  →   3.1.0
 node-rdkafka   2.6.1  →   2.7.1
 raw-body       2.4.0  →   2.4.1
 sinon          7.2.4  →   7.4.2
 tap-xunit      2.3.0  →   2.4.1
 tape          4.10.1  →  4.11.0

.ncurc.json

@@ -1,11 +1,4 @@
 {
   "reject": [
-    "async",
-    "sinon",
-    "events",
-    "node-rdkafka",
-    "raw-body",
-    "tap-xunit",
-    "tape"
   ]
-}
+}

package.json

@@ -44,25 +44,25 @@
   },
   "dependencies": {
     "@mojaloop/central-services-logger": "8.1.1",
-    "async": "2.6.2",
+    "async": "3.1.0",
     "base64url": "3.0.1",
     "clone": "2.1.2",
     "data-urls": "1.1.0",
     "debug": "4.1.1",
     "events": "3.0.0",
-    "node-rdkafka": "2.6.1",
-    "raw-body": "2.4.0"
+    "node-rdkafka": "2.7.1",
+    "raw-body": "2.4.1"
   },
   "devDependencies": {
     "faucet": "0.0.1",
     "nyc": "14.1.1",
     "npm-audit-resolver": "1.5.0",
     "npm-check-updates": "3.1.23",
     "pre-commit": "1.2.2",
-    "sinon": "7.2.4",
+    "sinon": "7.4.2",
     "standard": "14.3.0",
-    "tap-xunit": "2.3.0",
-    "tape": "4.10.1",
+    "tap-xunit": "2.4.1",
+    "tape": "4.11.0",
     "tapes": "4.1.0"
   },
   "publishConfig": {

src/kafka/consumer.js

@@ -406,9 +406,9 @@ class Consumer extends EventEmitter {
       }, 1)
 
       // a callback function, invoked when queue is empty.
-      this._syncQueue.drain = () => {
+      this._syncQueue.drain(() => {
         this._consumer.resume(this._topics) // resume listening new messages from the Kafka consumer group
-      }
+      })
     }
 
     switch (this._config.options.mode) {